Curve Tracer Design for Measuring Semiconductor Components Dionisius Adrianta Wardhana

Transcription

1 Curve Tracer Design for Measuring Semiconductor Components Dionisius Adrianta Wardhana Eindhoven, 28 July 2013

2 Content Static Measurement Method Measurement Method & Recommendation 2

3 Static Measurement Method Measurement Method 1 billion CAN chips shipped ( BU Automotive) Analyze returning products from customer 80% because of damaged ESD protection diode Curve tracer as an ideal solution Compact in size, low cost, and user friendly Continuation project Decrease measurement time 3

4 Damaged ESD Protection Static Measurement Method Measurement Method 4

5 5 Static Measurement Method Measurement Method Design a curve tracer Test equipment unit Plotting points & symmetries Shown as a V-I graph Produce less measurement time

6 Diode Static Measurement Method Measurement Method Id = Diode current (Amps) Is = Saturation current (Amps) e = Euler Constant (~2.7) q = Charge of electron (1.6 x coulombs) Vd = Voltage across diode (Volts) n = non-ideality coefficient (typically 1) k = Boltzmann s constant (1.38 x ) T = Junction temperature (Kelvin) 6

7 7 The Methods Static Measurement Method Measurement Method How to reduce measurement time? Static Input DC Sweep Input AC Waveform How to make it user friendly? Reduce the circuit complexity Built in the FPGA Board

8 The Methods ( cont d) Static Measurement Method Measurement Method Was built on: Altium Designer: EDA software package for printed circuit board, embedded software design Altium NanoBoard 3000: FPGA platform device manufactured by Altium 8

9 Static Measurement Method Measurement Method The Methods ( cont d) Divided by two parts: Software Part Programming on FPGA board Hardware Part Specify the voltage to meet the requirement 9

10 Static Input Method Static Measurement Method measurement Use DC Sweep as input of curve tracer Requirements: Vinput: -10 to 10v Compatible with Altium NB3000 Diode tested : 1N

11 11 Static Input Method Hardware Design Static measurement measurement

12 12 Input shifter & Diode measurement Static Measurement Method measurement

13 Output Shifter Static Measurement Method measurement 13

14 Switch Static Measurement Method measurement 14

15 Static Input Method Hardware Design (2) Using Bidirectional Analog Switch to replace the MOSFETs Static Measurement Method measurement Input Voltage Output Voltage < VRef V Negative = Vref Zero > Vref V Positive 15

16 16 Static Input Method Hardware Design (3) Static Measurement Method measurement

17 17 Static Input Method Software Design Static measurement measurement

18 Static Input Method - Software Flowchart Static Measurement Method measurement 18

19 Measurement Setup Supply Static Measurement Method measurement Signal Generator Multimeter Altium NB3000 Bread Board 19

20 Static Input Method Result Static Measurement Method Actual measurement time cannot be produced yet The software is able to plot the output graph from the voltage acquired via the ADC measurement Less complexity than the previous year result 20

21 Input Method Static measurement measurement AC Waveform as an input: Sine Waveform Amplitude of 5V Frequency 50Hz Vin from -5V to 5V Saw tooth Waveform 21

22 Input Method Hardware Design Static measurement measurement 22

23 23 Measurement Setup Static measurement measurement Supply Multimeter Oscilloscope Signal Generator Altium NB3000 Bread Board

24 Input Method Oscilloscope Result Result on the oscilloscope screen Static measurement measurement Measurement Output Display X-Y Mode Display Yellow line: X Axis Green line: Y axis 24

25 Input Method-Software Design Static measurement measurement 25

26 Input Method-Programming Start i=0 adc_0 read Static measurement adc_1 read measurement i=i+1 i>50 1 Save data END 0 Draw point Draw line Rotate Canvas 26

27 Input Method FPGA Result Static measurement measurement Oscilloscope Result FPGA Board Result 27

28 Static measurement measurement Both of the s provide faster measurement time compared with previously made project Use of Altium NB3000 simplify the circuit Conducting AC waveform as an input of curve tracer provide satisfying measurement result The working frequency of the waveform signal is important to obtain the correct graph The voltage obtained needs to be translated first before going into/from the ADC and DAC 28

29 Recommendation Static measurement measurement Improve the of using waveforms as an input of the curve tracer Test other semiconductor components Create a logging system to maintain the data of measurement 29

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32 32 Diode as a mixer The importance of the diode is that it is non-linear (or non-ohmic), which means its response (current) is not proportional to its input (voltage)

33 Diode, will subtract another 0.7V on the final output of the circuit If we use an IC ( bidirectional analog swicthes), the manufacture have already compensate the value. 33

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